i get my veiled cham up at 6 ever morn, he doesn't seem to mind, once the lights turn on he is running around looking for food...if you already have the lights set at 9, i suggest slowly moving it back to 6.
if you jump from 9 to 6 in one night there could be some adverse effects on the poor little guy.
try moving it back by 15 min intervals every night, or every two nights.
thats what i did when i had to change it.